Question about Cars & Trucks
There are several things to check. Check the fuel pump pressure and flow . clean or replace the air filter. check the ignition timing and spark advance as the engine speed is increased . Check the throttle butterfly is fully open when the pedal is fully depressed . Check that the brakes are not binding by rocking the car back and forward it should be free to push.
Posted on Nov 29, 2014
Probly just needs tuneup--change plug wires or coil packs-they wear inside--get new thermostat-another reason for bad milage--listen for vacuum leaks-cud be causin lite to be on--get a pro scan using factory gear at a private shop
Posted on Nov 29, 2014
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Posted on Jan 02, 2017
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
Posted on Mar 05, 2010
Does it have the 2.3l Quad 4 engine? If so replace the plastic piece that the coils go into, they go bad and leak spark to the cam towers and then you get a nice one or multiple cylinder misfire.
Posted on Apr 30, 2010
I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.
Posted on Oct 22, 2010
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